Combined junk basket



April 16, 1968 K. R. MARSH 3,378,089

COMBINED JUNK BASKET Filed April 4, 1966 2 SheetsSnee' 1 4 4 4 vINVENTOR F 26 QQE KENNETH R MARSH BY a B+ /M.'

April 16, 1968 K. R. MARSH 3,378,089

COMBINED JUNK BASKET Filed April 4, 1966 2 Sheets-Sheet 2 ii I FIG. 4

W \NVENTOR KENNETH R. MARSH B BY United States Patent "ice 3,378,089COMBINED JUNK BASKET Kenneth R. Marsh, P.0. Box 1673, Lovington, N. Mex.8826!) Filed Apr. 4, 1966, Ser. No. 540,013 4 Claims. (Cl. 175-308) Thisinvention relates to junk baskets and, more particularly, to a devicefor removing both magnetic and non-magnetic debris from an oil well.

In recent years, magnetic fishing tools or junk baskets, such as shownin US. patents to Kirby, No. 2,668,077 and No. 2,790,116, have come intoWide use in the oil fields. In one aspect, my invention is animprovement upon this type of a magnetic junk basket. At leastpartially, my invention is to provide helical holes so that the fluid isjetted out at an angle to more efficiently agitate the debris and siltand mud.

Also, in recent years, more non-magnetic material has been used in thedrilling of oil wells. For example, diamond bits and tungsten carbidebuttons are in common use. It is desirable that debris of this nature beremoved from the well; however, the magnetic fishing tools or magneticjunk baskets are not adapted for this purpose. Therefore, in anotheraspect of my invention, I have pro vided a combined tool in the form ofimproved nonmagnetic basket for this purpose.

An object of this invention is to remove debris from an oil well.

stall, and operate.

The specific nature of the invention, as well as other objects, uses,and advantages thereof, will clearly appear from the followingdescription and from the accompanying drawing, the different views ofwhich are not necessarily to the same scale, in which:

.FIG. 1 is an elevational, mainly sectioned, view of a tool according tothis invention.

FIG. 2 is a sectional view taken on line 22 of FIG. 1.

FIG. 3 is a sectional view taken on line 33 of FIG. 1.

FIG. 4 is a top plan view of the lower pole plate and surrounding brassring.

FIG. 5 is a detailed sectional view taken on line 5-5 of FIG. 4.

FIG. 6 is a perspective view of the non-magnetic basket removed from theneck of the tool.

Referring more particularly to the drawing, it may be seen that the toolincludes tubular body 10. This tubular body has a plurality of sectionswhich are screwed together.

v The neck section 12 has an outside diameter on the lower portion whichis equal to the outside diameter of magnet section 14. The neck sectionhas a neck portion or neck 16 which has an outside diameter considerablyless than that of the magnetic section 14. Threads 18 at the top of theneck section 12 provide means for attaching the tool to a rotatingstring of drill stem.

Shoe 20 forms the lowermost section of the tubular body 10. Teeth 20 onthe bottom of the shoe 20 provide means for digging up the debris at thebottom of the well as is well known in the art. The outside diameter ofthe shoe and teeth means is the same as the outside diameter of themagnet section 14 which is cylindrical. The shoe 2% is threaded to themagnet section 14.

Magnet 24 is held within the magnet section 14 of the tubular body 10.The magnet 24 is a solid piece of permanent magnet well known to the artand more generally known by its trademark Alnico. The magnet 24 fitssnugly within a recess in lower pole plate 26 which is 3,378,689Patented Apr. 16, 1968 constructed of soft iron. Lower pole plate 26 hasbrass ring 28 surrounding and attached to it as by brazing. The brassring has an annular recess which mates with and rests upon internalshoulder or flange 30 of the extreme lower part of the magnet section14. The brass ring 28 has a plurality of holes 32 therethrough toconduct fluid from annular passageway 34 to the area of the teeth means22. The annular passageway 34 is formed between the sleeve-like magnetsection 14 and the magnet 24 therein.

The upper portion of the magnet 24 is snugly fitted within a recess inthe lower face of upper pole plate 36, which is also made of soft iron.The upper pole plate 36 butts against brass disc 38 which, in turn,butts against lower face 40 of the neck section 12.

The neck section 12 could be described as cup-shaped inasmuch as bore 42extends from the top of the base 44. The bottom face 49 is the bottom ofthe base 44. A

plurality of holes 46 are drilled from the bottom of the bore 42 at anangle through the base 44 to communicate with the annular passageway 34.

To assemble the tool, first a sleeve 48 of nonmagnetic material, such asaluminum, brass or babbitt, is telescoped over the magnet 24. The sleeve48 is shorter than the magnet. Next, the upper pole plate 36 and bottompole plate 26 are placed upon the magnetized magnet 24 and are held inplace by magnetic attraction also holding brass sleeve 48 in place.Thereafter, the magnet assembly, which includes the two pole plates 26and 36 and the brass ring 28, are inserted into place within the magnetsection 14 with the ring 28 setting upon shoulder 30. Then the brassdisc 33 is fitted over the upper pole plate 36 and the neck section 12is threaded onto the magnet section 14. Thereafter, the shoe 20 may beattached. It will be understood by those skilled in the art that any ofa plurality of shoes 20 with different teeth configuration could beused.

When assembled, it may be seen that there is a fluid passageway from thetop of the neck section 12, through the holes 46, into the annularpassageway 34, through the helical holes 32, and into the area of theteeth means 22.

Basket 50 for non-magnetic junk is cup-shaped. It has cylindrical sidewalls 52 and base 54. The base has a hole therethrough of the samediameter as the outside diameter of the neck 16. The basket is attached,as by welding, around the neck 16. The outside diameter of the basket isnot greater than the outside diameter of the body 10 at the magnetsection 14, which is the greatest outside diameter of the body 10. Thebasket or cup 50 has an open top and the upper edge or lip 56 thereof ishelical, spiraling upward from low point. 58 at the bottom of verticallip 60 to high point 62 at the top of the vertical edge. The tool is soconstructed that it rotates to advance the vertical lip 60 as shown byarrow A. This direction of rotation is correlated with the direc' tionof rotation of the teeth means 22 as shown by arrow B.

Also, it will be remembered that the helical holes 3 point in such adirection as to jet the fluid pumped through the tool in the samedirection (arrow B) as the teeth.

In operation, the tool is assembled upon the bottom of a string of drillstem (not shown). The tool is lowered to the bottom of an oil well androtated by the drill stem while fluid in the form of water, oil, or mud,is pumped through the drill stem and the tool. The fluid jetting fromthe holes 32, together with the teeth means 22, agitate and dislodge thedebris in the bottom of the well. The magnetic debris is attracted tothe bottom pole plate 26. Non-magnetic debris is washed by the flow offluid outward and around the outside of the tool.

As the flow of fluid rises to above the basket 50 upon the neck section12, its velocity will decrease. This is because the cross sectional areaof the annular passageway between the neck 16 and the bore of the well(not shown) is greater than the cross sectional area of the annularpassageway between the magnet section 14 and the bore of the well. Thisincrease in cross sectional area results in a decrease of the velocityof the fluid. With a decrease in velocity of fluid, the heavier,non-magnetic debris (such as diamonds and carbide tips) tend to fallwithin the basket 50. The collection of the debris within the basket 50is aided by the vertical edge 60 as the tool is rotated.

Thus, it may be seen that I have provided a superior tool for removingboth magnetic and non-magnetic debris from an oil well.

It will be apparent that the embodiment shown is only exemplary and thatvarious modifications can be made in operation, construction, materials,and arrangement within the scope of the invention as defined in theappended claims.

I claim as my invention:

' 1. A junk basket for an oil well comprising:

(a) a tubular body,

(b) a permanent magnet within the tubular body (c) spaced from the wallsof the body to provide fluid passageways between the walls of the bodyand the magnet,

(d) thread means at the top of the body for attaching it to a rotatingstring of drill stem,

(e) slanted teeth means on the bottom of the body for digging up debrisat the bottom of the well,

(f) a plurality of holes from the passageway between the magnet andwalls to the teeth means,

(g) said holes being slanted in the same direction as the teeth means,

(h) the neck of the body above the magnet having an outside diameterless than the outside diameter at the magnet and the teeth, and

(j) a cup surrounding the neck of the body,

(k) said cup having an open top.

2. The invention as defined in claim 1 wherein the open top of the cuphas (In) a helical lip with (n) a vertical axial edge.

3. A junk basket for an oil well comprising:

(a) a tubular'body,

(b) a permanent magnet within the tubular body (c) spaced from the wallsof the body to provide fluid passageways between the walls of the bodyand the magnet,

(d) thread means at the top of the body for attaching it to a rotatingstring of drill stern,

(e) teeth means on the bottom of the body for diggin up debris at thebottom of the well,

(f) the neck of the body above the magnet having an outside diameterless than the outside diameter at the magnet and the teeth, and

(g) a cup surrounding the neck of the body,

(h) said cup having an open top with (j) a helical lip and (k) avertical axial edge.

4. The invention as defined in claim 3 wherein (111) said vertical edgeis pointed the same direction as said teeth means, and

(n) the outside diameter of the cup is not greater than the outsidediameter of the body.

References Cited UNITED STATES PATENTS 2,670,800 3/1954 Stohn 166-992,723,836 12/1956 Fraser -403 2,729,494 1/1956 Trowbn'dge 29465.52,734,767 2/1956 Donham 166-65 2,790,116 4/1957 Kirby 294-655 2,830,6634/1958 Kirby 166-65 2,830,664 4/1958 Kirby -2 166-65 2,891,621 6/ 1959Walton et a1. 166-65 2,918,323 12/1959 Cofiee 294-655 JAMES A. LEPPINK,Primary Examiner.

1. A JUNK BASKET FOR AN OIL WELL COMPRISING: (A) A TUBULAR BODY, (B) APERMANENT MAGNET WITHIN THE TUBULAR BODY (C) SPACED FROM THE WALLS OFTHE BODY TO PROVIDE FLUID PASSAGEWAYS BETWEEN THE WALLS OF THE BODY ANDTHE MAGNET, (D) THREAD MEANS AT THE TOP OF THE BODY FOR ATTACHING IT TOA ROTATING STRING OF DRILL STEM, (E) SLANTED TEETH MEANS ON THE BOTTOMOF THE BODY FOR DIGGING UP DEBRIS AT THE BOTTOM OF THE WELL, (F) APLURALITY OF HOLES FROM THE PASSAGEWAY BETWEEN THE MAGNET AND WALLS TOTHE TEETH MEANS, (G) SAID HOLES BEING SLANTED IN THE SAME DIRECTION ASTHE TEETH MEANS, (H) THE NECK OF THE BODY ABOVE THE MAGNET HAVING ANOUTSIDE DIAMETER LESS THAN THE OUTSIDE DIAMETER AT THE MAGNET AND THETEETH, AND (J) A CUP SURROUNDING THE NECK OF THE BODY, (K) SAID CUPHAVING AN OPEN TOP.